Understanding Sql Query

Question

0.00/5 (No votes)

See more:

In this query from temp table 'DTLocal' data shown textbox. Here I cann't understand why ? marks is used. please help me

C#

txtTruckReceiptDate.Text = (DTLocal.Rows[0]["TruckReceiptDate"].ToString() == "" ? "" : DateTime.Parse(DTLocal.Rows[0]["TruckReceiptDate"].ToString()).ToString("dd-MMM-yyyy"));

txtDocHODate.Text = (DTLocal.Rows[0]["DOCHODate"].ToString() == "" ? "" : DateTime.Parse(DTLocal.Rows[0]["DOCHODate"].ToString()).ToString("dd-MMM-yyyy"));

Posted 8-Apr-13 21:39pm

Sumon562

Updated 8-Apr-13 21:45pm

Anurag Sinha V

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Anurag Sinha V · Answer 1 · 2013-04-08T21:53:00

Solution 2

Its basically a ternary operator. The question mark combined with the colon sign.
Works like this:

C#

string name = ABooleanExpression ? "Jack" : "Jill";

If the boolean exp is true then the variable name will be assigned as Jack, if not then the variable name will be Jill.

Refer this understanding in your code and you will get it.
Hope it helps.

-ANurag

Posted 8-Apr-13 21:53pm

Anurag Sinha V

Comments

Maciej Los 9-Apr-13 3:57am

+5!

Anurag Sinha V 9-Apr-13 4:10am

thank you... :)

CPallini 9-Apr-13 3:59am

Right, my 5. I completely misunderstood the code :-O

Anurag Sinha V 9-Apr-13 4:11am

thank you.. :)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-04-08T22:07:00

It is a Ternary Operator[^].

Quote:
condition ? first_expression : second_expression;

For first line of code...
condition - DTLocal.Rows[0]["TruckReceiptDate"].ToString() == ""
first_expression - ""
second_expression - DateTime.Parse(DTLocal.Rows[0]["TruckReceiptDate"].ToString()).ToString("dd-MMM-yyyy"))

If condition is satisfied the first_expression will be executed, otherwise second_expression will be executed.

So, for first line...

C#

txtTruckReceiptDate.Text = (DTLocal.Rows[0]["TruckReceiptDate"].ToString() == "" ? "" : DateTime.Parse(DTLocal.Rows[0]["TruckReceiptDate"].ToString()).ToString("dd-MMM-yyyy"));

Here it checks the value of DTLocal.Rows[0]["TruckReceiptDate"].ToString().
And
-> if the value is "", it assigns "" to txtTruckReceiptDate.Text,
-> otherwise it assigns DateTime.Parse(DTLocal.Rows[0]["TruckReceiptDate"].ToString()).ToString("dd-MMM-yyyy")) to txtTruckReceiptDate.Text